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Definitely use CiviRules. Why can't it use event tokens? If there's a specific shortcoming, why not log it with the team? I've a feeling some work may be done on it in the UK CiviSprint next week... ;)

From what I've been able to gather, the CiviRules SMS API uses a message template as the basis of the SMS. When setting up the message template through 'Mailings > Message Templates', those event fields don't appear as options. When I've copied and pasted the SMS content from the Scheduled Reminders settings (that in the screenshot above), the tokens themselves appear in the SMS that the contact receives rather than the event details.
– termdarkOct 5 '16 at 13:13

The shortcoming here then is "event tokens aren't being processed in CiviRules SMS messages". Log it as an issue on their GitHub, and with any luck some happy-go-lucky hacker-for-hire might address it next week ;)
– JohnFFOct 5 '16 at 13:38